Magnetic separator.



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T' a/ZZ whom/it may; concern:

- Be it knownthat LALVINDINGS, a citizen of the United States residlingiat'lvlilwaukee, county of Milwaukee, 'andjStateof Wiscon-f sin, haveinve'nted newand'usefnllmprovements in Magneticseparators, of which the following is aspecification. f'

f ZUNITED PATENTOFHCE? A vi ines, on MILWAUKEE, wlscoNifilitlf 7 d I j Myiinvention relates to 1niproveinen'tsin that class of magnetic separator-sin which the materialis first brought into direct contact with a magnetic carrierand the non-magnetic material then permitted tofall away from such surfaces prior. to the removal or 3 discharge ofthatvwhichis held to the carrier I The object OfmY'IIiVGH'tl OH is to provide loy'rnagnetic force.

fimeans-zwhereby the machines of'this class mayqbe rendered continuous "in their opera-' tion and Whereloythe material; will he sub jected in passing to theaction oa-plurality 2o, of magnetic poles, so that in'case any of the attracted inaterial 'should by reason of its I momentum or for any other cause fail to be 7 held-by one of the magnetic poles it would be 1 1 l caught and held by th'enexa;

l T A' furtherobject ofi inyih'vention is to pro-" vide means wherebythematerialmay be 0on5 tinuou'sly separated within'jaclosed cylinc a short-circuiting switchi drical jconveyerland" separately discharged to theexterior, thus renderingthestruc'ture eat-'- 9 ceedingly compact andisi nple in desigm In the following description-referenceis had'to the i accompanying drawings; in Whi0h- I 1. '2

Figure 1 ,is a side elevation ofdny'invene o tio'n', partly broken aWay QEiggZ is a dia-' grammatical end view ofther-same. Fig.3

is a detailvi'ew of one of "themagnets and its Like parts are identified the samer'ef erence characters throughout the several *Qviews.

*- 1 1 isa rotating cylinder formed of non-magobstructed. f The upperor- Y netic material and'proyided' with'a'nnular" ribs or flanges 2 inear] each end, which rest, upon? ldriving-pulleysf 3,:{the latter being so in an .in-f

the cylinder enables nielto dispense with an centralportion; of the cylinder free and unfront end of the {MAGNETIQL SF I I I srnclncAwz ongforming'p re of Letters nt stine. 7o7,oss, astealia u st 19,1902; 1 A v Applioation filed April 3,1901. Serial No: 54,771-illlo modeh) q I I I cylinder is formedwith aperipheral screen, t,

"while thelj'owerior rear, endI'is (provided with an'annular row. of electromagnetso, located {on the outersurfaceofi the cylinder, with in-' 'wardly-projecting pole-piecesid The elec-' tromagnets are preferablyofthe horseshoe "type',:with"the two legs al-ined longitudinally 1; of the cylinder,- to' which theyjare'sec'ured by means of; headed rods, which are inserted from the interior of the cylinder thrbughsuitable apertures inits periphery and through thG Willdli] gs of the magnet.andscrewedinto inwardly-projecting polerpieces of the magy 7 nets, butalso holdthe magnets inposit1on on,

Th" magnets are "connected in series by means of conductors 10, as illustrated'i'n Fig; 2, and are energized from anysuitalole source :of electric power ,through'th'e medium of the brushesllyannnlar conducting-rings 12, lo

' cated'on the periphery ofthe cylinder, and the ccond 'uctorsl3 and 14 leading from the respectiverings to the initial and terminal magnets of the series; Each conductor,whicli is directly connected with one of the magnets, is proyided with ashunt 1 5,'hat ing electricalcony 1 nection' with a-yielding switch"16,,preferably.

of spring metal and which-is adapted when subjected to pressureytobe'brought'into contact, with an electrode 17, which is electricallyconnecte'd with-acondnctor of similar;

polarity leading to the nextgsucceeding-magnet. In other words, the 'conductorl3is proyvidedfwith the. shunt Jl5and'switch16, soar ranged thatu rhen the latter, is brought into 'contactwith its corresponding electrode 17 a 7 direct electricalconnectionfwill be made be a a 1 'tw'een the conductor 13 and the cond ictor 10 between the initial'and nextfs'ucc'eeding magnet of the" series, the initial n 'agnet being thus j short-circuited; The pnext";succeeding 3 magnet may be similarly.shortcircuited. by I a "means ofthe next succeeding switch, and so onthroughout the series IOO Foroperatingthe short-circuitingswitches 16 I have provided "a segniental shoe'l8, which is located above the cylinder 1 and with which the switches are successively-brought into contact as, the cylinderis rotated. The

ends 19 of the shoe and the free ends of the switches are oppositely curved or faced, so that when these parts are brought into contact the ends of the switches will be forced inwardly by the shoe into contact with their respective electrodes 17. With this construction the uppermost magnets of the cylinder will always be short-circuited while passing underneath the shoe 18'.

The material is fed into the cylinder at its upper or front end by means of a hopper 21, and as the cylinder is rotated the dust and finer particles of the material will be sifted out through the screen 4, while the remaining material slowly passes toward the front end by the action of gravity. As the material passes the magnets the magnetically-attracted particles adhere to the pole-pieces, while the remaining particles are permitted to pass and drop from the lower portion of the rear end of the cylinder. The material attracted by the magnets, however, is carried upwardly with the revolution of the cylinder until the magnets holding such material are short-circuited through the medium of their corresponding switches 16, as heretofore described, when the magnets will be deenergized and the material permitted to drop into a chute 22, by which it is conveyed to any suitable point of discharge.

As there is no axially-supporting shaft for the cylinder 1 the chute 22 may be easily inserted into the cylinder in a position to'receive all the material discharged by the shortcircuited magnets. 7

While other means for deenergizing the magnets may be employed, such as switches or commutator bars or brushes, without departing from the scope of my invention, yet the short-circuiting switches are preferred for this purpose, as it enables me to connect the magnets in series, which makes it practical to wind them for available commercial voltages without using expensive fine wire. The use of the segmental shoe enables me to apply such devices to a rotary cylinder, and the current is thus absolutely continuous and subject to substantially the same resistance. I also attach great importance to the use of the rounded pole-pieces 6, which are incapable of supporting non-magnetic material, but which consist of the ends of the magnetcores and are easily rendered strongly magnetic.

If desired, suitable brushes 25 maybe employed to facilitate the removal of the material from the deuergized magnets in case any of it should adhere thereto on account of the residual magetism, oil, or dampness.

It will also be understood that it is not absolutely necessary that the pole-pieces of the magnets should project into the interior of the cylinder, although this construction is preferred, as it is much easier to hold the attracted material when in direct contact with the magnets. I attach great importance to the fact that in my device the material is first brought into direct contact with the surfaces to which it is to be held and the non-attracted material subsequently permitted to fall away.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The combination with a rotary, openended, non-magnetic cylinder a series of electromagnets mounted thereon; magnet-cores extended through the cylinder and provided with rounded heads on the interior surface thereof; annular conducting-rings located on the cylinder; and brushes for connecting the same with a source of electrical energy, said magnets being electrically connected in series with rings; a resilient bar for each magnet also electrically connected with the rings, and adapted to serve as a shunt for its corresponding magnet when in. contact with a terminal beyond such magnet; and a segmental shoe located in the path of the bar and adapted to force the bar downwardly into contact with the terminal when passing the shoe, said.

bar being normally out of contact with the terminal.

2. The combination with a diagonally-disposed, rotary, non-magnetic cylinder; of 'a cylindrical screen forming a continuation thereof, at its upper end; an annular series of electromagnets exteriorly disposed around its lower end; conducting-rings connected with a source of electrical energy, and electrically connected with the magnets; and circuit-controlling mechanism adapted to energize and denergize the magnets successively, each of said magnet-s being provided with a core extending through the cylinder, and headed on the interior surface, said core and head being integral,and the head being rounded or semispherical in .form, whereby it not only serves to hold the magnet in position, but also concentrates the magnetic force over a small surface exposed to the material passing through the cylinder.

The combination with. a rotary, non-magnetic cylinder provided with an annular row of magnets, and conducting-rings adapted to conveyan electricalcnrrent through the magnets; of a series of resilient bars, each member of which is connected with the circuit on one side of one of the magnets; a terminal located in the circuit, on the other side of each magnet, and normally out of contact with its corresponding bar; and a segmental guideshoe arranged in the path of the bars, and adapted to force them into contact with their terminals; said bars being arched and ar- ICC IIO

ranged for angular sliding contact with the guide-shoe.

In testimony whereof I afiiX my signature in the presence of two witnesses.

ALVIN DINGS.

WVitnesses:

JAs. B. ERWIN, LEVERETT 0. WHEELER. 

